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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Device CCID Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_class_ccid.h"
#include "ux_device_stack.h"
#if defined(UX_DEVICE_STANDALONE)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_ccid_notify_task_run PORTABLE C */
/* 6.2.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the background task of the CCID. */
/* */
/* It's for standalone mode. */
/* */
/* INPUT */
/* */
/* ccid Pointer to CCID class */
/* */
/* OUTPUT */
/* */
/* State machine status */
/* UX_STATE_EXIT Device not configured */
/* UX_STATE_IDLE No streaming transfer running */
/* UX_STATE_WAIT Streaming transfer running */
/* */
/* CALLS */
/* */
/* */
/* CALLED BY */
/* */
/* USBX Device Stack */
/* */
/**************************************************************************/
UINT _ux_device_class_ccid_notify_task_run(UX_DEVICE_CLASS_CCID *ccid)
{
UX_INTERRUPT_SAVE_AREA
UX_SLAVE_DEVICE *device;
UX_DEVICE_CLASS_CCID_SLOT *slot;
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_TRANSFER *transfer;
UCHAR *buffer;
ULONG length;
UCHAR icc_mask;
INT immediate_state = UX_TRUE;
UINT status;
/* Get the pointer to the device. */
device = &_ux_system_slave -> ux_system_slave_device;
/* Check if the device is configured. */
if (device -> ux_slave_device_state != UX_DEVICE_CONFIGURED)
return(UX_STATE_EXIT);
/* Interrupt IN endpoint get (it's optional so it's OK not found). */
endpoint = ccid -> ux_device_class_ccid_endpoint_notify;
if (endpoint == UX_NULL)
return(UX_STATE_IDLE);
transfer = &endpoint -> ux_slave_endpoint_transfer_request;
/* Process states. */
while(immediate_state)
{
/* Check states. */
switch(ccid -> ux_device_class_ccid_notify_state)
{
case UX_DEVICE_CLASS_CCID_NOTIFY_IDLE:
return(UX_STATE_IDLE);
case UX_DEVICE_CLASS_CCID_NOTIFY_LOCK:
/* Wait until status locked. */
UX_DISABLE
if (ccid -> ux_device_class_ccid_flags & UX_DEVICE_CLASS_CCID_FLAG_LOCK)
{
UX_RESTORE
return(UX_STATE_WAIT);
}
ccid -> ux_device_class_ccid_flags |= UX_DEVICE_CLASS_CCID_FLAG_LOCK;
UX_RESTORE
/* Next: check if there is notification pending. */
ccid -> ux_device_class_ccid_notify_state = UX_DEVICE_CLASS_CCID_NOTIFY_START;
/* Fall through. */
case UX_DEVICE_CLASS_CCID_NOTIFY_START:
/* Check slot notifications (optimized for only one slot). */
/* Get slot. */
slot = ccid -> ux_device_class_ccid_slots;
/* Build slot change/hardware error message. */
buffer = transfer -> ux_slave_transfer_request_data_pointer;
length = 0;
/* By default no message. */
buffer[UX_DEVICE_CLASS_CCID_OFFSET_MESSAGE_TYPE] = 0;
/* Check hardware error notification. */
if (slot -> ux_device_class_ccid_slot_flags &
UX_DEVICE_CLASS_CCID_FLAG_NOTIFY_HW_ERROR)
{
slot -> ux_device_class_ccid_slot_flags &=
(UCHAR)~UX_DEVICE_CLASS_CCID_FLAG_NOTIFY_HW_ERROR;
buffer[UX_DEVICE_CLASS_CCID_OFFSET_MESSAGE_TYPE] =
UX_DEVICE_CLASS_CCID_RDR_TO_PC_HARDWARE_ERROR;
buffer[UX_DEVICE_CLASS_CCID_OFFSET_HW_ERROR_SLOT] = 0;
buffer[UX_DEVICE_CLASS_CCID_OFFSET_HW_ERROR_SEQ] =
slot -> ux_device_class_ccid_slot_hw_error_seq;
buffer[UX_DEVICE_CLASS_CCID_OFFSET_HW_ERROR_CODE] =
slot -> ux_device_class_ccid_slot_hw_error;
length = 4;
}
/* Check slot change notification. */
else if (slot -> ux_device_class_ccid_slot_flags &
UX_DEVICE_CLASS_CCID_FLAG_NOTIFY_CHANGE)
{
slot -> ux_device_class_ccid_slot_flags &=
(UCHAR)~UX_DEVICE_CLASS_CCID_FLAG_NOTIFY_CHANGE;
/* Message type. */
buffer[UX_DEVICE_CLASS_CCID_OFFSET_MESSAGE_TYPE] =
UX_DEVICE_CLASS_CCID_RDR_TO_PC_NOTIFY_SLOT_CHANGE;
/* Slot state bit. */
icc_mask = (UCHAR)((slot -> ux_device_class_ccid_slot_icc_status ==
UX_DEVICE_CLASS_CCID_SLOT_STATUS_ICC_NOT_PRESENT) ?
0u : 1u);
/* Slot change bit. */
icc_mask |= 0x02u;
/* Save slot state and change. */
buffer[UX_DEVICE_CLASS_CCID_OFFSET_SLOT_ICC_STATE] = icc_mask;
length = 2;
}
/* Unlock status. */
ccid -> ux_device_class_ccid_flags &= ~UX_DEVICE_CLASS_CCID_FLAG_LOCK;
/* Check message to see if there is message to send. */
if (buffer[UX_DEVICE_CLASS_CCID_OFFSET_MESSAGE_TYPE] == 0)
{
/* There is no pending meesage, -> idle. */
ccid -> ux_device_class_ccid_notify_state = UX_DEVICE_CLASS_CCID_NOTIFY_IDLE;
return(UX_STATE_IDLE);
}
/* There is message to send. */
UX_SLAVE_TRANSFER_STATE_RESET(transfer);
transfer -> ux_slave_transfer_request_requested_length = length;
ccid -> ux_device_class_ccid_notify_state = UX_DEVICE_CLASS_CCID_NOTIFY_WAIT;
/* Fall through. */
case UX_DEVICE_CLASS_CCID_NOTIFY_WAIT:
length = transfer -> ux_slave_transfer_request_requested_length;
status = _ux_device_stack_transfer_run(transfer, length, length);
/* Error/success (done) case. */
if (status <= UX_STATE_NEXT)
{
/* Transfer done, check if there is pending message. */
ccid -> ux_device_class_ccid_notify_state = UX_DEVICE_CLASS_CCID_NOTIFY_LOCK;
return(UX_STATE_WAIT);
}
/* Wait transfer. */
return(UX_STATE_WAIT);
default:
break;
}
}
/* Unhandled state. */
return(UX_STATE_EXIT);
}
#endif
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